These are tiny style changes: - Add a blank line before a "return". - Renames two globals to use the "watchdog_hardlockup" prefix. - Store processor id in "unsigned int" rather than "int". - Minor comment rewording. - Use "else" rather than extra returns since it seemed more symmetric. Reviewed-by: Petr Mladek <pmladek@xxxxxxxx> Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx> --- Changes in v5: - watchdog_hardlockup_dumped_stacks => watchdog_hardlockup_all_cpu_dumped - watchdog_hardlockup_processed => watchdog_hardlockup_warned Changes in v4: - ("Style changes to watchdog_hardlockup_check ...") new for v4. kernel/watchdog.c | 32 +++++++++++++++----------------- 1 file changed, 15 insertions(+), 17 deletions(-) diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 12ce37d76e7d..169e5dffbc00 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -89,8 +89,8 @@ __setup("nmi_watchdog=", hardlockup_panic_setup); static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts); static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved); -static DEFINE_PER_CPU(bool, hard_watchdog_warn); -static unsigned long hardlockup_allcpu_dumped; +static DEFINE_PER_CPU(bool, watchdog_hardlockup_warned); +static unsigned long watchdog_hardlockup_all_cpu_dumped; static bool is_hardlockup(void) { @@ -100,6 +100,7 @@ static bool is_hardlockup(void) return true; __this_cpu_write(hrtimer_interrupts_saved, hrint); + return false; } @@ -110,21 +111,20 @@ static void watchdog_hardlockup_kick(void) void watchdog_hardlockup_check(struct pt_regs *regs) { - /* check for a hardlockup - * This is done by making sure our timer interrupt - * is incrementing. The timer interrupt should have - * fired multiple times before we overflow'd. If it hasn't + /* + * Check for a hardlockup by making sure the CPU's timer + * interrupt is incrementing. The timer interrupt should have + * fired multiple times before we overflow'd. If it hasn't * then this is a good indication the cpu is stuck */ if (is_hardlockup()) { - int this_cpu = smp_processor_id(); + unsigned int this_cpu = smp_processor_id(); - /* only print hardlockups once */ - if (__this_cpu_read(hard_watchdog_warn) == true) + /* Only print hardlockups once. */ + if (__this_cpu_read(watchdog_hardlockup_warned)) return; - pr_emerg("Watchdog detected hard LOCKUP on cpu %d\n", - this_cpu); + pr_emerg("Watchdog detected hard LOCKUP on cpu %d\n", this_cpu); print_modules(); print_irqtrace_events(current); if (regs) @@ -137,18 +137,16 @@ void watchdog_hardlockup_check(struct pt_regs *regs) * generating interleaving traces */ if (sysctl_hardlockup_all_cpu_backtrace && - !test_and_set_bit(0, &hardlockup_allcpu_dumped)) + !test_and_set_bit(0, &watchdog_hardlockup_all_cpu_dumped)) trigger_allbutself_cpu_backtrace(); if (hardlockup_panic) nmi_panic(regs, "Hard LOCKUP"); - __this_cpu_write(hard_watchdog_warn, true); - return; + __this_cpu_write(watchdog_hardlockup_warned, true); + } else { + __this_cpu_write(watchdog_hardlockup_warned, false); } - - __this_cpu_write(hard_watchdog_warn, false); - return; } #else /* CONFIG_HARDLOCKUP_DETECTOR_PERF */ -- 2.40.1.698.g37aff9b760-goog